0x01 背景知识
With few exceptions, disk drives are set to 512 bytes per block, and operating systems expect disks to be formatted to 512 bytes per block. In fact, some operating systems and/or disk controllers won’t even “see” disks that aren’t formatted to 512 bytes/block. Certain RAID controllers require disks to be formatted to 520 or 528 bytes/block. With few exceptions, disk
